691770424 has 8 divisors (see below), whose sum is σ = 1297069560. Its totient is φ = 345885208.

The previous prime is 691770421. The next prime is 691770427. The reversal of 691770424 is 424077196.

It is an interprime number because it is at equal distance from previous prime (691770421) and next prime (691770427).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×691770424² = 957092639042279552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691770421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43235644 + ... + 43235659.

It is an arithmetic number, because the mean of its divisors is an integer number (162133695).

Almost surely, 2^691770424 is an apocalyptic number.

It is an amenable number.

691770424 is a deficient number, since it is larger than the sum of its proper divisors (605299136).

691770424 is a wasteful number, since it uses less digits than its factorization.

691770424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86471309 (or 86471305 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 691770424 is about 26301.5289289425. The cubic root of 691770424 is about 884.4107173312.

The spelling of 691770424 in words is "six hundred ninety-one million, seven hundred seventy thousand, four hundred twenty-four".